A fast, private, 100% client-side toolkit. No server, no upload. Beautify, compress, validate and escape JSON. JSON Tree Viewer Visualize JSON as a collapsible tree. Convert JSON arrays to CSV format. Convert between JSON and XML. Convert between JSON and YAML. Edit JSON with live validation and tree preview. JSON Key Sorter Sort JSON keys alphabetically. JSON ↔ URL Query Convert between JSON and query strings. Mock JSON Generator Generate random mock test data with faker.js. Generate Java/Go/TS/Python/C#/SQL from JSON. Convert between JSON and TOML configs. JSON5 with comments / trailing commas / unquoted keys / Infinity, to standard JSON and back. Timestamp Converter Convert between Unix timestamp and date with timezone. Parse cron expressions into human-readable text. Track multiple time zones at once. Date Difference Days, weeks, months between two dates. Convert Solar/Lunar, Gan-Zhi, zodiac. Working days between dates. Centisecond stopwatch with multi-lap timing and keyboard shortcuts. Countdown Timer Live days / hours / min / sec to an event; save events locally. Almanac (万年历 / 老黄历) Perpetual calendar with lunar dates, solar terms, Gan-Zhi and Yi/Ji. Encode and decode Base64 in your browser. URL Encode / Decode Percent-encode or decode URLs and query params. Hash / MD5 / SHA Compute MD5, SHA-1/256/384/512, CRC32 and HMAC. Number Base Converter Convert between binary, octal, decimal and hex. Convert text to Unicode/hex escapes and back. File / Image to Base64 Convert files or images to Base64 data URLs. Text ↔ International Morse Code. Morse Code Audio Play Morse with Web Audio tones, adjustable pitch / WPM, WAV export. Download Link Converter URL ↔ Thunder / qqdl / FlashGet interconvert. Base32 / Base58 / Base62 Text ↔ Base32 / Base58 (Bitcoin) / Base62, BigInt-based. ASCII / Character Code Full ASCII + extended tables, Unicode codepoint ↔ char converter (UTF-8 / UTF-16). Generate RFC-4122 v4 UUIDs securely. Generate a downloadable QR code image. Pick colors, convert HEX/RGB/HSL, generate palettes. Preview Lottie animations with play/pause/loop. Password Generator Generate strong passwords with custom length and charset. Barcode Generator Generate barcodes (CODE128, EAN13, UPC, etc.). Generate placeholder text in paragraphs. Spin the wheel to pick a random option. Font Awesome Icons Search and copy FA6 icon HTML. Contrast Checker WCAG color contrast ratio. Baidu / Google hot searches. Color Scheme Generator Complementary / analogous / triadic / tetradic / monochrome palettes + CSS / JSON / Tailwind export. Coupon / Activation Code Batch-generate random codes, crypto-unbiased, prefix / suffix / separators, Luhn option. Local sticky notes: colors, pin, search, drag-to-reorder. Saved in browser. Shield Badge Generator shields.io-style SVG badges: label / value / color / style / logo, URL + Markdown + SVG. Test JavaScript regular expressions live. Variable Name Converter camelCase, snake_case, kebab-case, PascalCase. Text Diff Checker Compare two text blocks and highlight differences. Text Processing Dedup, sort, trim, case convert and more. Email Validator Bulk check email format, valid vs invalid. Title to URL-friendly slug. Number to Words Number to English words / Chinese. Translate 20+ languages, auto-detect. Render text as large character blocks. ASCII Table Generator CSV / TSV → Markdown / ASCII / HTML table. Remove duplicate lines: keep-first or sort, case / trim options. Keyword Density Word / n-gram frequency + density for SEO copy review. English Abbreviations 180+ IT / business / medical / chat abbreviations, CN + EN. Reverse, shuffle, strip blank lines, number lines, column pick, vertical, full/half-width. CSV ↔ JSON / TSV, preview & edit as table, custom delimiter / quoting / header. Text Statistics Characters / words (EN+CN) / sentences / paragraphs / lines / reading time / top keywords, live. Live KaTeX rendering of LaTeX formulas with 40+ templates. Typing Speed Test Measure WPM, accuracy and errors with Chinese / English passages. Special Symbols Emoji, punctuation, math, box-drawing, currency, Greek, arrows — one-click copy. Simplified ↔ Traditional Chinese simplified / traditional (TW/HK) converter. Forbidden Words Scan copy for China ad-law / e-commerce / short-video bans. Chinese to Pinyin Convert characters to pinyin with tones, polyphones resolved. Character Decomposer Look up radical, stroke count and structure. Find Chinese homophone puns (耗子尾汁 / 鸭梨山大). Generate 藏头诗 from a phrase — fun, not literary. Character Counter Count characters, words, lines and reading time. ID Card Validator China ID check + extract birthdate / gender / region, 15→18 conversion. Baby Name Generator 200+ Chinese name characters with meanings & Wu-Xing, random suggestions, favorites. Chinese Surnames (百家姓) Hundred Family Surnames: browse single & compound with Pinyin and classic rank. Idiom Dictionary & Chain Idiom (成语) look-up, word-chain game and structure filters. Two-part allegorical sayings — search, browse, random. Synonyms & Antonyms Synonyms and antonyms for common Chinese words. Chinese Riddles (字谜灯谜) Character / idiom / thing riddles — guess, search, filter. Classical Poems & 飞花令 Tang & Song classics search + Feihualing. Chinese Classics (国学启蒙) Full text of 三字经 / 千字文 / 百家姓 / 弟子规. Famous Quotes (名言名句) Classic Chinese & Western quotes — search + random. Couplets (对联 / 春联) Spring / famous / trade couplets — search & filter. Area Code / ZIP / Plate Look up a Chinese city by name, area code, ZIP or plate. Chinese Zodiac (十二生肖) Year → animal, personality, matches, fortune. Zodiac Signs (星座) Birthday → sign, element, personality, matches. Dream Interpretation (周公解梦) Search dream motifs for traditional meanings. 24 Solar Terms (二十四节气) Dates, meaning, customs and health tips. Markdown Editor Write Markdown with live preview and export. Online Spreadsheet Excel-like sheets with formulas and charts. View, merge, split, rotate PDF pages. Rich Text Editor Full-featured editor with HTML/Markdown export. Word Doc Editor Import .docx, edit and export HTML. CAD / DXF Viewer View DXF files with pan, zoom and layers. View STEP/IGES/BREP 3D models, rotate and export. View and edit CSV as a table. Draw shapes and import/export DXF. Grid Paper Printable Square / dot / hex / isometric / 米字格 paper, print or SVG / PNG. Chinese handwriting practice sheets, tracing or empty. Subtitle Converter SRT / WebVTT / ASS / SSA interconvert + timeline offset. Infinite hand-drawn canvas, export PNG/SVG. Freehand canvas with eraser and undo. Sign and export a PNG image. Offline Whiteboard Canvas whiteboard, runs offline. Markdown outline to live mind map, SVG export. Interactive mind map, add/edit nodes, JSON export. Flowcharts, architecture, UML diagrams. AES / DES / 3DES Symmetric encryption and decryption. RSA Encrypt / Decrypt Generate RSA keys, encrypt and decrypt. Decode JWT tokens and inspect header and payload. Encrypt/decrypt Cisco Type 7 passwords. PEM Certificate Parse X.509 PEM certificates. Hash Identifier

Detect hash algorithm type. RC4 Encrypt / Decrypt Hand-rolled RC4 (KSA + PRGA), hex / Base64 output. CSS Bezier Generator Create cubic-bezier() easing curves visually. CSS Gradient Generator Create linear, radial and conic gradients. Glassmorphism Generator backdrop-filter frosted-glass cards with live preview. Neumorphism Generator Soft-UI dual-shadow buttons and cards. Box / Text Shadow Generator Multi-layer box-shadow / text-shadow with inset. Flexbox Visualizer Visual flex layout, copy-direction/justify/align/gap. CSS Grid Visualizer Template-columns, gap, justify/align-items live. CSS Animation / @keyframes 12 @keyframes presets, live preview, copy-ready CSS. CSS Gradient Text background-clip: text gradient text, linear / radial, live preview, copy CSS. Code Formatter & Minifier Beautify or minify code with Prettier. Tabs/spaces, trim, strip comments. Beautify and format SQL queries. Format, beautify and validate XML. GraphQL Formatter Prettify / minify GraphQL queries, lightweight tokenizer. Code Highlighter highlight.js code coloring with theme switch and HTML copy. Escape / unescape HTML entities + cheat sheet. Convert curl command to Python / JS / Node / PHP / Go. HTML Live Preview Write HTML and see live rendered preview. Robots.txt Generator User-agent, rules, sitemap, with one-click presets. Sitemap.xml Generator URL list → standard sitemap with lastmod/freq/priority. SEO Meta Generator title/description/OG/Twitter + SERP preview. HTML ↔ JS / JSX / PHP HTML ↔ document.write / template literal / JSX / PHP echo. JSON to Multi-Language Swift / Kotlin / Dart / Rust / Ruby / PHP / Scala types from JSON. Press any key to see its keyCode and code. Cookie/Header Parser Parse cookies and HTTP headers, edit, export. Searchable HTTP status code reference. Extension ↔ MIME type lookup. User-Agent Parser Decode UA into browser, engine, OS and device. WebSocket Tester Connect ws/wss, log messages with timestamps and direction. Internationalized domains ↔ ACE (xn--) conversion. Disk Partition Calc Integer-GB partition MB value with formula comparison. 100+ common commands with examples and category filter. Run XPath over XML/HTML via document.evaluate. Screen Pixel Ruler On-screen ruler with draggable guides, px + mm distance. Regex Cheat Sheet Metacharacters, classes, quantifiers, anchors, lookarounds, flags + common patterns, searchable. Postman-like HTTP client: params / headers / body, response status / time / size, optional CORS proxy. Obfuscate JavaScript to protect source code. SHA-1/256/384/512, MD5, CRC32 of any file. Identify file type from its header bytes. htpasswd Generator Apache .htpasswd: BCrypt / APR1 / SHA1. PKCS#10 CSR + RSA private key, node-forge, local-only. Gzip Compress / Decompress Text ⇄ gzip ⇄ Base64 via native CompressionStream, with size + ratio. Image Compressor Compress PNG, JPG and WebP in your browser. Format, minify and preview SVG images. Edit images with brush, shapes, text and filters. Online Photoshop Pro photo editing: layers, adjustments, filters, export. Crop, rotate, color, stickers, text and filters. AI Background Remover Remove image backgrounds with on-device AI. Image Watermark Add text/image watermark, single or tiled, batch. BPM 40-240, 2/3/4/6 time signatures, accented downbeat, Web Audio. Mic + autocorrelation pitch detection, EADGBE / chromatic. Waveform trim, fade in/out, export WAV (PCM 16-bit). Image Format Converter Convert PNG / JPG / WebP with quality slider. Generate multi-size .ico favicon from PNG. Placeholder Image Generate PNG/SVG placeholder images by size and color. Grid Image Slicer Slice an image into 2×2 / 3×3 / 3×4 tiles. Festival Avatar Stamp National Day / Christmas / Spring / Mid-Autumn themes on a photo. Stamp Impact top/bottom text onto an image or built-in template. Extract every frame of an animated GIF as PNG. Drag a selection, crop every frame, re-encode. Scale GIF by pixels or percent, keep aspect ratio. Color Palette Library Material / Tailwind / brand colors, CSS gradients, CN & JP traditional colors. CSS Sprites Generator Merge icons into one PNG sprite + .icon CSS classes with background-position. Recursive-backtracking DFS maze, BFS shortest path, PNG / SVG export. Color Blindness Test Ishihara-style plates generated on canvas, screen normal / red-blind / green-blind. Subnet Calculator Calculate network, broadcast and host range. Proxy Node Parser Parse VMess/VLESS/Trojan/SS node URIs. Parse/generate magnet URIs and info-hash. IP ↔ decimal/binary/hex conversion. IP / MAC Address Generator Batch random IPv4 / IPv6 / MAC, private ranges + vendor OUI. Scientific Calculator Expression evaluator with math.js. Fraction Calculator Add/sub/mul/div fractions with steps + GCD/LCM. Fraction Reducer Reduce fractions to lowest terms with GCD steps, improper ↔ mixed, compare. Percentage Calculator Four percent modes: of, ratio, growth, reverse. BMI + China / WHO grade, healthy weight range, body-fat %. D4–D100, 1-20 dice, totals, max/min, history. 3D animated toss with stats and streak tracking. Reaction Time Test Red → green, 5–10 rounds, average / fastest / slowest + rank, early-click detection. Arabic ↔ Roman numeral conversion. Number to Chinese RMB uppercase. Chart Generator Pie / bar / line / scatter / radar on pure canvas + PNG. Thousands / scientific / Chinese / percent / precision / ordinal, live. Sort Visualizer Bubble / selection / insertion / quick / merge / heap on canvas, with compare & swap stats. GCD & LCM Calculator Greatest common divisor & least common multiple of integers with prime factorization. Permutation & Combination P(n,k), C(n,k), n^k, with-repetition variants and factorial, exact BigInt. Solve / play the 24 game: enumerate every + − × ÷ expression reaching the target. Convert length, weight, temperature, data and more. Calculate screen PPI, dot pitch and aspect ratio. Data Storage Converter bit / B / KB / MB / GB / TB / PB / EB, 1024 vs 1000. Haversine great-circle distance + bearing, multi-leg total. Carton Size Calculator Pick a standard carton + dim-weight for shipping. Paper Size Reference ISO A/B/C, US, Chinese paper sizes + matcher. Clothing / shoes / underwear / ring sizes across regions. 80+ countries: mains voltage, frequency, plug type. Income Tax Calculator China IIT cumulative withholding (2024 brackets). Mortgage Calculator Monthly payment, equal-payment/principal. Multi-Channel Timer Parallel count-up / count-down timers with beep. 25/5/15 work–break cycles with beep + notifications. What To Eat Today Spin the food wheel, exclude & save picks. Blood Type Inheritance Child ABO types from parents; infer the other parent. Kinship Calculator Chinese relative titles from a relationship chain. All 118 elements with category colors, search and detail. Chinese Dynasties Dynasty timeline with capitals, founders and events. 150+ countries: capital, currency, language, dial code. China Universities 985 / 211 / 双一流 lookup by province and tag. 100+ top-level domains: meaning, category, country. Fullscreen scrolling text banner for concerts / pickups. Passport Validator Real-time format check for 16 countries' passport numbers + rule table. Currency in Words Number to uppercase words for USD / EUR / JPY / GBP / CNY and 10+ currencies. Compound Interest Future value with principal, rate, years, recurring contributions and compounding frequency. Bank Card BIN Lookup First 6 digits → issuing bank & debit/credit type. Number Fortune (81 数理) Check a number against the traditional 81-number fortune table.